It shows that the pair mated. :)
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The circle and the square are the two parents.
In a pedigree, a vertical line and a bracket connect _____.
Those are parralel lines.
On a graph, you will have a vertical numbered line and a horizontal numbered line. The vertical one is called the "y-axis" and the horizontal is the "x-axis." You are either looking for a line, shape, or arc that touches, or "intercepts" on the x-axis (horizontal line).
It is called a horizontal line!